--  @testpoint:opengauss关键字prior(非保留)，作为函数名

--关键字不带引号-成功
drop function if exists prior;
create function prior(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function prior;
--关键字带双引号-成功
drop function if exists "prior";
create function "prior"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
drop function "prior";
--关键字带单引号-合理报错
drop function if exists 'prior';
create function 'prior'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `prior`;
create function `prior`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/